[PATCH v2 4/4] HID: asus: avoid memory leak in asus_report_fixup()
From: Günther Noack
Date: Thu Feb 19 2026 - 10:44:41 EST
The asus_report_fixup() function was returning a newly allocated
kmemdup()-allocated buffer, but never freeing it. Switch to
devm_kzalloc() to ensure the memory is managed and freed automatically
when the device is removed.
The caller of report_fixup() does not take ownership of the returned
pointer, but it is permitted to return a pointer whose lifetime is at
least that of the input buffer.
Also fix a harmless out-of-bounds read by copying only the original
descriptor size.
Assisted-by: Gemini-CLI:Google Gemini 3
Signed-off-by: Günther Noack <gnoack@xxxxxxxxxx>
---
drivers/hid/hid-asus.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 8ffcd12038e8..7a08e964b9cc 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -1399,14 +1399,21 @@ static const __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
*/
if (*rsize == rsize_orig &&
rdesc[offs] == 0x09 && rdesc[offs + 1] == 0x76) {
- *rsize = rsize_orig + 1;
- rdesc = kmemdup(rdesc, *rsize, GFP_KERNEL);
- if (!rdesc)
- return NULL;
+ __u8 *new_rdesc;
+
+ new_rdesc = devm_kzalloc(&hdev->dev, rsize_orig + 1,
+ GFP_KERNEL);
+ if (!new_rdesc)
+ return rdesc;
hid_info(hdev, "Fixing up %s keyb report descriptor\n",
drvdata->quirks & QUIRK_T100CHI ?
"T100CHI" : "T90CHI");
+
+ memcpy(new_rdesc, rdesc, rsize_orig);
+ *rsize = rsize_orig + 1;
+ rdesc = new_rdesc;
+
memmove(rdesc + offs + 4, rdesc + offs + 2, 12);
rdesc[offs] = 0x19;
rdesc[offs + 1] = 0x00;
--
2.53.0.371.g1d285c8824-goog